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SC 500HE-US
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Maintenance Manual
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SMA SC 500HE-US Maintenance Manual

CA
US
Central Inverter
SUNNY CENTRAL 500HE-US/CA
Maintenance Manual
SC500HEUS-eng-WH-IUS120411 | 98-4103011 | Version 1.1
SMA America, LLC Legal Restrictions
Copyright © 2012 SMA America,LLC. All rights reserved. No part of this document may be reproduced, stored in a retrieval system, or transmitted, in any form
or by any means, electronic, mechanical, photographic, magnetic or otherwise, without the prior written permission of SMA America,LLC.
Neither SMA America,LLC nor SMA Solar Technology Canada Inc. makes representations, express or implied, with respect to this documentation or any of the equipment and/or software it may describe, including (with no limitation) any implied warranties of utility, merchantability, or fitness for any particular purpose. All such warranties are expressly disclaimed. Neither SMA America,LLC nor its distributors or dealers nor SMA Solar Technology Canada Inc. nor its distributors or dealers shall be liable for any indirect, incidental, or consequential damages under any circumstances.
(The exclusion of implied warranties may not apply in all cases under some statutes, and thus the above exclusion may not apply.)
Specifications are subject to change without notice. Every attempt has been made to make this document complete, accurate and up-to-date. Readers are cautioned, however, that SMAAmerica,LLC and SMA Solar Technology Canada Inc. reserve the right to make changes without notice and shall not be responsible for any damages, including indirect, incidental or consequential damages, caused by reliance on the material presented, including, but not limited to, omissions, typographical errors, arithmetical errors or listing errors in the content material.
All trademarks are recognized even if these are not marked separately. Missing designations do not mean that a product or brand is not a registered trademark.
The Bluetooth
®
word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by SMA America,LLC and SMA Solar Technology Canada Inc. is under license.
SMA America, LLC
3801 N. Havana Street
Denver, CO 80239 U.S.A.
SMA Solar Technology Canada Inc.
2425 Matheson Blvd. E
8th Floor
Mississauga, ON L4W 5K5
Canada
Important Safety Instructions SMA America, LLC
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IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions for the following products:
• Sunny Central 500HE-US/CA
This manual must be followed during installation and maintenance.
The product is designed and tested according to international safety requirements, but as with all electrical and electronic equipment, certain precautions must be observed when installing and/or operating the product. To reduce the risk of personal injury and to ensure the safe installation and operation of the product, you must carefully read and follow all instructions, cautions and warnings in this manual.
Warnings in this document
A warning describes a hazard to equipment or personnel. It calls attention to a procedure or practice, which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the SMA equipment and/or other equipment connected to the SMA equipment or personal injury.
Symbol Description
DANGER indicates a hazardous situation which, if not avoided, will result in death or serious injury.
WARNING indicates a hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
NOTICE is used to address practices not related to personal injury.
4 SC500HEUS-eng-WH-IUS120411 Maintenance Manual
SMA America, LLC Important Safety Instructions
Other Symbols in this document
In addition to the safety and hazard symbols described on the previous pages, the following symbol is also used in this manual:
Symbole Description
Indicates information that is important for a specific topic or objective, but is not safety-relevant.
☐ Indicates a requirement for meeting a specific goal.
☑ Desired result
✖ A problem that could occur
Markings on this product
The following symbols are used as product markings with the following meanings.
Symbol Description
Warning regarding dangerous voltage
The product works with high voltages. All work on the product must only be performed as described in the documentation of the product.
Electric arc hazards
The product has large electrical potential differences between its conductors. Arc flashes can occur through air when high-voltage current flows. Do not work on the product during operation.
Beware of hot surface
The product can become hot during operation. Do not touch the product during operation.
Observe the operating instructions
Read the documentation of the product before working on it. Follow all safety precautions and instructions as described in the documentation.
Evaluated to the requirements of the Underwriters Laboratories Standard for Safety for Inverters, Converters, Controllers and Interconnection System Equipment for Use With Distributed Energy Resources, UL 1741.
The inverter has been additionally evaluated by Underwriters Laboratories to CAN/CSA C22.2 No. 107.1-1, "General Use Power Supplies."
General Warnings SMA America, LLC
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General Warnings
General Warnings All elect rical installation s must be done in acco rdanc e with the local and NationalElectrical Code
ANSI/NFPA 70 or the Canadian Electrical Code® CSAC22.1. This document does not and is not intended to replace any local, state, provincial, federal or national laws, regulations or codes applicable to the installation and use of the product, including without limitation applicable electrical safety codes. All installations must conform with the laws, regulations, codes and standards applicable in the jurisdiction of installation. SMA assumes no responsibility for the compliance or non-compliance with such laws or codes in connection with the installation of the product.
Before installing or using the product, read all of the instructions, cautions, and warnings in this manual.
Before connecting the product to the electrical utility grid, contact the local utility company. This connection must be made only by qualified personnel.
Wiring of the product must be made by qualified personnel only.
®
6 SC500HEUS-eng-WH-IUS120411 Maintenance Manual
SMA America, LLC Table of Contents
Table of Contents
1 Notes on this Document. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1 Intended Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2 Target Audience Skills. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3 Personal Protective Equipment . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4 Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1 Design of the Inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.2 User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1 Maintenance Intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2 Preparing for Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2.1 Identifying the Inverter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2.2 Reading Error Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.3 Performing Visual Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3 Maintenance under Dead Conditions. . . . . . . . . . . . . . . . . . . . 19
4.3.1 Disconnecting the Inverter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3.2 Checking Safety Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3.3 Disassembling the Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3.4 Cleaning the Air Baffle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3.5 Cleaning the Air Duct and Insect Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.3.6 Cleaning the Inside of the Switch Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.3.7 Cleaning the Heating Elements of the Low-Temperature Area Option
(Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.3.8 Checking the DC Main Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.3.9 Checking the Surge Arresters (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.3.10 Checking the Connection of the Power Cables Using Terminal Lugs
(Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table of Contents SMA America, LLC
4.3.11 Retightening the Connection of the Power Cables Using Cage Clamps
(Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.3.12 Checking the Seals on Doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.3.13 Checking Locking Devices, Door Stops, and Hinges . . . . . . . . . . . . . . . . . . 35
4.3.14 Checking the Surface of the Switch Cabinet. . . . . . . . . . . . . . . . . . . . . . . . . 36
4.3.15 Checking the Switch Cabinet for Corrosion . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.4 Performing Maintenance Work on Inverters with Activated
Control Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.4.1 Connecting the Control Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.4.2 Checking the AC Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.4.3 Checking Heating Elements, Fans and Hygrostat . . . . . . . . . . . . . . . . . . . . . 38
4.4.4 Checking the Heating Elements of the Low-Temperature Area Option
(Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.5 Mounting the Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5 Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
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SMA America, LLC 1 Notes on this Document

1 Notes on this Document

This manual describes the service and maintenance of the Sunny Central 500HE-US/CA.
Validity
This manual is valid for the Sunny Central 500HE-US/CA.
Target Audience
This manual is intended for qualified skilled workers. Only qualified personnel are allowed to perform the tasks described in this manual (see Section 2.2 "Target Audience Skills", page 10).
Additional Information
Additional information is available at www.SMA-America.com:
Title Document type
Sunny Central 500HE-US/CA - User Manual User manual
Sunny Central 500HE-US/CA - Installation Manual Installation manual
Installation Manual: Disconnect Unit Installation manual
Nomenclature
In this manual, the Sunny Central 500HE-US/CA is also referred to as the Sunny Central or the inverter.
In this manual, SMA America Production, LLC and SMA Solar Technology Canada Inc. are hereinafter referred to jointly as SMA.
2 Safety SMA America, LLC

2Safety

This section describes general safety rules that must always be observed when working on and with the Sunny Central. Read this section in order to prevent personal injury and property damage and to ensure long-lasting operation of the Sunny Central.

2.1 Intended Use

The Sunny Central is an inverter that converts direct current generated in the PV modules into alternating current when the DC input voltage is in the 330 V to 600 V range, and when the permissible ambient conditions are adhered to. The alternating current that is generated is fed into the power distribution grid by a transformer that is connected in series. The Sunny Central is suitable for operation in outdoor areas. The Sunny Central meets NEMA 3R protection class standards and can also be operated in rain, snow, and sleet.
Only persons meeting all of the qualification standards for the target audience may work on or with the Sunny Central.
Intended use also includes observance of the service and maintenance intervals specified in this document.
All work on the Sunny Central must be performed with the appropriate tools. In order to ensure that the Sunny Central is used as intended, this documentation must be read and
all safety precautions and messages must be duly noted and followed. The Sunny Central may not be rebuilt or modified, and additional component parts may not be
installed without the express consent of SMA America, LLC. The Sunny Central may not be operated with its doors open. The Sunny Central may not be opened when it is raining or when humidity exceeds 95%. The Sunny Central may only be operated when it is in perfect working order. This must be ensured by
observance of the service and maintenance intervals specified in this document. In addition, the maintenance work that has been performed must be documented by the customer in the maintenance report and also with photos.
Any use of the Sunny Central other than what is described in this section is not regarded as intended use.

2.2 Target Audience Skills

A qualified skilled person has been adequately trained and has demonstrated the ability and knowledge to operate and maintain the device. A qualified skilled person has been trained in how to deal with the dangers and risks associated with installation of electrical equipment as specified in 29 CFR, Chapter XVII, Part 1910 (OSHA), NEC, and NFPA 70E, and has all the necessary knowledge for averting danger. There must be written documentation of the training.
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SMA America, LLC 2 Safety

2.3 Personal Protective Equipment

After the control voltage has been switched on, personal protective equipment is required for all work performed. The protective equipment must comply with the requirements of NFPA 70E. The customer must ensure that external measures limit incident energy levels to PPE level 2, in conformance with IEEE1584.
Protective equipment required by legal regulations or otherwise prescribed must be added accordingly.

2.4 Safety Precautions

This section contains safety precautions that must always be observed during work on or with the Sunny Central. To prevent personal injury and property damage, and to ensure long-lasting operation of the Sunny Central, read this section carefully and follow the instructions.
Maintenance Manual SC500HEUS-eng-WH-IUS120411 11
2 Safety SMA America, LLC
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Electrical Hazards
Electric shock from live voltage
High voltages are present in the inverter and its component parts. Some maintenance work must be done with voltage present. Failure to adhere to the safety messages may lead to severe or lethal injuries due to electric shock.
• Wear class 2 personal protective equipment.
• Always perform work in compliance with the regulations specified in 29 CFR, Chapter XVII, Part 1910 (OSHA), NEC, and NFPA 70E.
• Do not touch any live component parts of the inverter or the medium voltage grid.
• Follow instructions precisely.
• Observe safety messages.
• Before performing a ny work on t he inverter, a lways disconn ect the inverter if voltage does not absolutely need to be present.
• After disconnecting the inverter, wait at least 10 minutes until the inverter's capacitors have discharged completely.
• Before performing work on the inverter, ensure that no voltage is present.
Electric shock caused by ground fault
In a ground fault, plant sections that are supposedly grounded may in fact be live. Failure to adhere to the safety messages may lead to severe or lethal injuries due to electric shock.
• Ensure that no voltage is present before touching.
• Wear personal protective equipment.
Electric shock due to damaged inverter
Operating a damaged inverter can lead to hazardous situations that may result in serious or lethal injuries due to electric shock.
• Operate the inverter only if it is in safe and technically faultless working order.
• Operate the inverter only if there is no visible damage.
• Regularly check for visible damage.
• Make sure that all external safety equipment is freely accessible at all times.
• Make sure that all safety equipment is in good working order.
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SMA America, LLC 2 Safety
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Damage to electronic component parts due to electrostatic discharge
Electrostatic discharge can damage or destroy electronic component parts.
• Observe the ESD safety regulations when working on the unit.
• Wear personal protective equipment.
• Discharge the electrostatic charge before touching electronic component parts, for example by touching the door's PE connection.
Environmental Hazards
Danger to life due to blocked escape routes
In hazardous situations, blocked escape routes can lead to serious injury or death.
• An escape route at least 3 ft (915 mm) wide must be available at all times.
• Do not place any objects in the escape route area.
• Remove all tripping hazards from the escape routes.
Damage to the inverter caused by dust or moisture penetration
Dust intrusion or moisture penetration can damage the inverter or impair its functionality.
• Do not open the inverter when it is raining or when humidity exceeds 95%.
• Perform maintenance on the Sunny Central only when the environment is dry and free of dust.
Hazards Due to Human Error
Danger to life due to electric shock when inverter is unlocked
Unlocked inverters can be opened by unauthorized persons. This means that unauthorized persons have access to component parts on which lethal voltages are present.
• Ensure that unauthorized persons have no access to the inverter.
• Always lock the inverter.
Maintenance Manual SC500HEUS-eng-WH-IUS120411 13
2 Safety SMA America, LLC
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Mechanical Hazards
Risk of fire due to failure to observe torque specifications
Failure to follow the torque specifications indicated in the installation manual reduces the ampacity of the screw connections. This can cause component parts to overheat and catch fire.
• Always use the torques specified in the installation manual.
• Regularly check that mounted components have always been set at the torque specified in the installation manual.
Danger from illegible or missing warning signs
Warning signs on the Sunny Central warn operators about hazardous areas and must always be present and legible.
• Regularly check to be sure that all warning signs are present and undamaged.
• Immediately replace missing, faded, or damaged warning signs.
Thermal Hazards
Risk of burns due to hot component parts
The component parts of the Sunny Central can become very hot. Touching these component parts can lead to burn injuries.
• Do not touch hot component parts.
• Wait until hot component parts have sufficiently cooled down.
• Observe safety messages in the Sunny Central.
• Wear class 2 personal protective equipment.
14 SC500HEUS-eng-WH-IUS120411 Maintenance Manual
SMA America, LLC 3 Product Description

3 Product Description

This section will give you an overview of the Sunny Central 500HE-US/CA and its components.

3.1 Design of the Inverter

Figure 1: Design of the inverter
Position Designation
A Inverter cabinet
B Insect screen, air intake area
C Connection cabinet for customer interfaces
D Connection cabinet for AC and DC power cables
E Ventilation grid, air outlet

3.2 User Interface

Figure 2: Display and key switch
Position Designation
ADisplay
BKey switch
Maintenance Manual SC500HEUS-eng-WH-IUS120411 15
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